The degree of the concentration of lead (Pb) that induces toxicity in the pteridophytes of lower vascular plants remains unknown. The present study was therefore intended to investigate the degree of Pb accumulation in Marsilea minuta Linn, with its effect on the physiological and biochemical basis of heavy metal tolerance. Mining and smelting operations, Pb2+ containing paints, fuel and explosives, as well as the disposal of urban sewage sludge enriched in Pb and emissions from motor vehicles & industrial plants are the product of lead contamination. Plants were permitted to absorb lead salt at lower concentrations (0 μM, 0.1 μM, 0.3 μM, 0.5 μM and 1.0 μM) during hydroponic culture for 12 days, and significant degradation of plant biomass was recorded. T T However more metals than leaves were consumed by the roots. Changes in leaf area, allocation of biomass, leaf chlorophyll content, total carbohydrate content and protein content have been monitored. Higher concentrations of up to 1.0 μM decreased the quality of biomass and chlorophyll. In the early days of treatment, a significant decrease in total protein content was observed, accompanied by a sharp rise in treatment of 0.3 μM, 0.5 μM and 1.0 μM. The overall carbohydrate content was reduced by 1.0 μM and increased by 0.5 μM compared to control conditions.
Department of Botany, Sree Narayana College, Nattika, Thrissur, Kerala 678508 (Affiliated to University of Calicut, Malappuram, Kerala), India.
Dr. J. Shereena
Department of Botany, Sree Narayana College Alathur, Palakkad, Kerala, 678682, India.
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